.emoji_content {
    box-shadow: 0 0 4px 0;
    width: 400px;
    max-height: 160px;
    overflow-y: auto;
    background-color: #fff;
}
.emoji_item {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    cursor: pointer;
}
.emoji_item:hover {
    background-color: #eee;
}